To highlight:
Change #1: Beginning in the Fall of 2015, Magic Blocks Will Be Two Sets Each
Change #2: Beginning in the Fall of 2015, Magic Will Have Two Blocks Per Year
Change #3: Beginning in 2016, the Core Sets Are No More
Change #4: Beginning in 2016, the First Set of Each Block (the Fall and Spring Sets) Will Cause a Rotation
Change #5: Beginning in 2016, Standard Will Be Three Blocks Rather Than Two Blocks